Influence of Dy substitution for Ga on the magnetic properties of arc-melted Fe-Ga alloys

Abstract

The structural, magnetic, and magnetostrictive properties of Fe73-Ga27-x-Dyx (x = 0, 0.25, 0.50, 0.75, and 1) alloys synthesised by arc melting and quenching at 1000 oC were investigated. X-Ray Diffraction (XRD) analysis confirms the Body-Centered Cubic (BCC) nature of the alloys and the presence of an A2 phase of -Fe throughout the composition, despite the presence of Dysprosium (Dy). It was revealed that the grains are primarily composed of Fe and Ga, but the grain boundaries contain Fe, Ga, and a very high concentration of Dy. The grains indicate that Dy segregates more at grain boundaries. The low saturation magnetization ~ 100 emu/g achieved at x = 0.25 is due to Dy-rich phase precipitation. The enhanced magnetostriction ~ 119 ppm is related to a significant number of Dy-rich phase precipitates and short-range ordering. However, after x = 0.50, the amount of Dy-rich precipitates has a negative impact on the magnetostrictive behaviour of Dy-substituted Fe-Ga alloys, resulting in a decrease in magnetostriction. This demonstrates that the inclusion of Dy enhances the magnetostrictive quality of Fe-Ga alloys.

Nebulized spray pyrolysis deposited CdO thin films for liquefied petroleum gas and ethanol gas sensor

“…Where, T is the transmittance and t is the film thickness. 5(b) shows absorption spectra for the same and the estimated optical band gap 2.16 to 2.28 eV which are deduced from the (αhυ) 2 Vs photon energy (hυ) plots (Tauc plot) given in the 5(c) [28,29]. Band gap (E g ) of the neb-deposited thin films were increasing while increasing the T S , which depicted in figure 5(d)).…”

Tuning of magnetic properties of Al-doped cobalt ferrite nanofiber prepared by electrospinning technique

“…Thus, the net magnetization effect is given as M = M B -M A. The energy required by the Al 3+ cations to occupy octahedral sites (B sites) is smaller than the tetrahedral sites (A sites) [33][34][35]. Hence, Fe 3+ cations are substituted by the Al 3+ cations in the octahedral sites which reduce the superexchange interaction i.e.…”